Automatic guard for printing-presses.



No. 68I,954. Patented Sept. 3,, I90l.

' T. 6. DEXTER.

AUTOMATIC GUARD FOR PRINTING PRESSES (Application filed Oct. 8, 1900.)

5 Sheets-Sheet I.

(No Model.)

R Y m a E E N M W a O o v T o N u in 1 R u A 1:; A O.. m 1% o L. N J T w mw kn n \0 No. 68I,954. Patented Sept. 3, lsplg 'r. c. DEXTER.

AUTOMATIC GUARD FOR PRINTING PRESSES.

(Application filed Oct 8, 1900.) (No Model.) 5 Sheets-Sheet 2.

INVENTOR HTTORNEY No. 681,954. Patented Sept. 3, l90l.

T. c. DEXTER. AUTOMATIC GUARD FOR PRINTING PBESSES.

(Application filed Oct. 5, 1900. (No Model.) 5 Sheets-Sheet 3.

. ,v 510% ATTQP "m: uonms vzrzas co. PnOlO-LATHO,WASMNGION. o c,

N0. (i8|,954. Patented Sept. 3, I90];

T. C. DEXTER.

AUTOMATIC GUARD FOR PRINTING PBESSES.

(Application filed Oct. 6, 1900.)

5 Sheets-Sheet 4.

(No Model.)

WITNESSES: aggwmldv, i

No. 68l,954. Patented Sept. 3, l90l,

T. C. DEXTER. AUTOMATIC GUARD FOB PRINTING PRESSES.

(Application filed Oct. 8, 1900.)

5 Sheets-Sheet 5.

(No Medial.)

WITNESSES: S QQJWMZ ATTORNEY "m: NORRIS vnzns w. FNDTDLITNO wAsmusrm, o. c.

UNITED STATES PATENT (DEEICE.

TALBOT O. DEXTER, OF PEARL RIVER, NEW YORK.

AUTOMATIC GUARD FOR PRlNTlNG-PRESSES.

fSPECIFICATION forming part of Letters Patent No. 681 ,954, dated September 3, 1901. Application filed October 8, 1900. Serial No. 32,340. (No model.)

To all whom it may concern:

Be it known that I, TALBOT-O. DEXTER, a citizen of the United States, and a resident of Pearl River, in the county of Rockland, in the State of New York, have invented new and useful Improvements in Automatic Guards for Printing-Presses, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to devices employed for automatically protecting the impressioncylinder of an operating printing-press from injury incident to the clogging of the impression-cylinder by hindrance in the delivery of the paper from said cylinder.

The object of the invention is to provide a more sensitive and reliable guard for quickly arresting the motion of the printing-press in case of a defect in the delivery of the paper from the impression-cylinder; and to that end the invention consists in the combination, with the impression-cylinder and its actuatin-g mechanism, of a pneumatic tripper controlling said mechanism, a guard disposed to be actuated by paper retarded in its passage from the impression-cylinder, and means actuated by said guard and controlling the aforesaid tripper; and the invention also consists in certain novel details of the construction and combination of parts, as hereinafter described, and set forth in the claims.

In the annexed drawings, Figure 1 is a side elevation of a printing-press equipped with my present invention. Fig. 2 is a plan view of the same. Fig. 3 is an enlarged side view of my invention shown in position for automatically stopping the printing-press. Fig. 4 illustrates a modification of the pneumatic tr-ipper. Figs. 5 and 6 are transverse sections of the two-way cock employed in the afore said modification, and Figs. 7 and 8 are side views of other modifications in the arrangement of the pneumatic tripper shown in different operative positions.

A represents the impression-cylinder of a two-revolution printing-press or other frontdelivery press.

B denotes the paper-feeding machine,which may be of any suitable and well-known construction.

C is the feed-board, and a the tapes which convey the paper from the feeding-machine to the impression-cylinder.

1) represents the fingers which strip the printed paper from the impression-cylinder and conduct said paper to the usual fly D.

The impression-cylinder and feeding-machine are actuated in common by suitable mechanism, preferably consisting of a gear 1, mounted on the driving-shaft o, and a train of gears 2, 3, 4, 5, 6, and 7, the last of which is attached to a horizontal shaft 8, mounted in bearings in the side walls of a stationary case E. Another train of gears transmits motion from the shaft 8 to the feeding-machine.

An upright lever d is pivoted at its lower end to a stationary block and is connected by a rod 6 to one of the arms of a bell-crank f, whose other arm is suitably connected to the usual hand-lever f, by means of which the driving-belt F is shifted on the driving-pulley G and loose pulley G in the usual manner for starting and stopping the press. A spiral spring e, surrounding the portion of the rod e inside the case E, forces the lever 01 toward the shaft 8, and thereby causes said lever to move the lever f in a direction which shifts the belt F from the driving-pulley onto the loose pulley.

To the shaft 8 is fastened a cam 6 which during the rotation of said shaft intermittently presses on a roller 61, pivoted to the side of the lever d, and forces said lever in opposition to the spring 6 and to a position which causes the lever f to shift the belt onto the drivingpulley. To confine the lever 01 in its cam-forced position while said cam is turned from said lever, a detaining-arm g is secured at one end to a rock-shaft g, by means of which said arm is carried at properly-timed intervals to a position to engage a shoulder 01 on the lever d. The rock-shaft 9" receives motion by means of another arm h, attached to said shaft and having pivoted to its free end a roller which rides on a cam 9, attached to the shaft 8, as shown in Fig. 2 of the drawlogs.

The lever d, with its described actuating devices and detaining-arm g, constitutes the stop'mechanism. The chief purpose of this invention is to control said mechanism by a suitable pneumatic tripper, a guard disposed ducting fingers b and normally parallel therewith, as represented in Fig. 1 of the drawings. The said main portion of the guard-finger is in sufficient proximity to the top of the conducting-finger b to cause said guard-finger to be swung on its pivot and yield to the upward pressure of the paper when accidentally buckled by contact of the advance edge of the paper with the ends of the fly-fingers or other hindrance in the passage of the paper over the fingers b, as represented in Fig. 3 of the drawings. This movement of the guardfinger I utilize to control the Valvej of an air-pipe P, which may be connected either to an air-exhaust cylinder 0 or to an exhaustfan H or to some suitable exhaust-chamber. I preferably attach the valve j to a lever 3', extending from the rear end of the guard-finger, as shown in Fig. l of the drawings, said valve facing the mouth of the pipe P and closing said mouth when the guard-finger i is in its normal position. A spring '5 is connected at one end to the bracket t and at the opposite end to an arm 11 on the end of the shaft 7., said spring drawing arm 1' down onto an adjustable stop t serving to sustain the guardfingert' in its normal position. In the cylinder 0 are the two pistons O and 0 one of which is connected by a rod is to one end of a lever I, which is pivoted intermediate its ends to a stationary support and has connected to its opposite end a rod It, receiving reciprocating motion from a cam k attached to the shaft 8, and forcing said rod in one direction, and a spring 71: forcing it in the opposite direction. The piston O is thus reciprocated in the cylinder 0. The other piston O is connected by a rod Z to the tripper J, which in this case is of the form of a bellcrank having one of its arms connected to the rod Z and its other arm provided with a hook J, adapted to engage the free end of an upward extension 9 of the detaining-arm g.

The operation of the automatic tripper thus far described is as follows: When the paper passes in proper order from the impressioncylinder A to the fingers b and thence to the fly D, the guard-finger t' remains in its normal position, as shown in Fig. 1 of the drawings, and when in this position the valvej closes the mouth of the pipe P, and thus cuts off the air from the cylinder 0. The piston 0 being in 'the meantime drawn back from the piston 0 causes a suction between the pistons and compels the piston O to move with the piston O. This movement causes the tripper J to be thrown into a position to 'tached to the pipe P, and a lever H attached release the upward extension 9 of the de= taining-arm g, which is thereby allowed to drop, with its free end, into engagement with the shoulder 01 on the lever 61 in time to prevent said lever from being actuated by the spring e while the cam c is turned from said lever, and thus the actuating mechanism of the press and feeder are maintained in motion. If, however, the paper issuing from the impression-cylinder becomes buckled on the conveying-fingers b by accidental interference with the travel of the paper, as hereinbefore mentioned, the buckling of the pa per causes the guard-fingert' to be thrown out of its normal position, as represented in Fig. 8 of the drawings. This action of the guard-finger 't'carries the valve j away from the mouth of the pipe P and allows the air to enter said pipe and pass to the cylinder 0, and thus destroy the vacuum therein. This allows the piston O to move without effecting either the piston O or the valve j. The result is that the piston O is free to be moved by gravity of the tripper J, which drops into engagement with the extension 9 of the detaining-arm g, which is thus retained in its elevated position, to which it is carried by the action of the cam 9, hereinbefore described. Said retention of the arm 9 allows the lever d to be actuated by the spring e While the cam c is turned from said lever. This movement of the lever 61 causes the driving-belt to be shifted onto the loose pulley, and thus the motion of the press and feeder is arrested.

The piston O and its actuating mechanism may be dispensed with by closing the end of the cylinder thereat and connecting the pipe P either to an exhaust-fan H or to a suitable exhaust-chamber, as hereinbefore stated and as illustrated in Fig. 4 of the drawings, in which case a two-way cock H is to be at- I I0 to said cock, is to be connected by a rod 3' to a lever j attached either to the shaft t" or to the end of the guard-finger 1', attached to said shaft. When said guard-finger is in its nor-' mal position, as shown in Fig. 4 of the draw- :15 ings, the two-way cock H is turned into the position shown in Fig. 6 of the drawings, which causes the air to be drawn out of the cylinder 0, and by the suction of said air the piston O is drawn toward the closed end of the cylinder. Said piston is connected by a rod Z directly to the upward extension of the detaining-arm g, which is thus carried by the aforesaid movement of the piston O to a position to engage the shoulder 61 on the lever 61 and retain said lever in a position to maintain the belt F on the drivingulley. When the guard-finger '11 is actuated by the paper being buckled on the fingers b, the leverj turns the two-way cock into a position (shown in Fig. 5 of the drawings) which admits air to the cylinder 0 and allows the piston O to move toward the open end of the cylinder, and thus cause the detaining-arm g to drop out of its aforesaid engaging position. The lever d thus released is then actuated by the spring e and caused to shift the belt onto the loose pulley. Hence the motion of the press is arrested whenever the guard finger t' is thrown out of its normal position.

The automatic stopmechanism may be f urther modified and simplified by employing a prop R, pivoted at its lower end to a station ary support and connected at its upper end by a rod R to the piston O of the cylinder 0, as represented in Figs. 7 and S of the drawings, in which R denotes a branch pipe leading to a suitable exhaust apparatus. (Not shown.) In this instance the normal position of the guard-finger 1) causes the prop R to be drawn into a position to release the detaining-arm g and allow said arm to hold the lever d in position to retain the driving-belt on the driving-pulley, as represented in Fig. 7 of the drawings. When the guard-finger is disturbed from its normal position, as shown in Fig. 8 of the drawings, the prop R is allowed to move into a position to arrest the detaining-arm g in its elevated position, and thus allow the lever d to be actuated by the spring 6, which causes the belt to be shifted onto the loose pulley.

On printing-presses equipped with a feeding-machine for automatically supplying the paper to the impression-cylinder it is preferred to employ in addition to the described guard-fingerz' suitable feelers disposed on the feed-board and normally in the path of the paper to the impression-cylinder, so as to be actuated by the paper in transit, and by suitable connection with the detaining arm 9 cause said arm to hold the lever d in position to maintain the driving-belt on the drivingpulley so long as the said feelers are actuated by the paper passing to the impressioncylinder. Such devices are shown in Figs. 1, 2, and 3 of the drawings and are similar to those shown in my prior application for Letters Patent, Serial No. 9,201, filed March 19, 1900, and consist of feelers 'n, pivoted to arms n, fastened to a transverse shaft 01 which is supported at its ends in brackets n mounted on the feed-board. In the brackets 12 are pivoted the ends of a rock-shaft 0, from which extend the arms 0, which during their rocking motion are adapted to come in contact with the tops of props n extending from the feelers n, said contact taking place when the feelers are undisturbed from their normal position, which position they assume when the paper fails to pass under said feelers. To the end of the rock-shaft 0 is fastened an armp, which by means of a rod 0" is connected to the arm h, hereinbefore described. The aforesaid contact of the arms 0 with the tops of the props 07. arrests the movement of the rockshaft 0 and causes the arm p to retain the arm 72. in its elevated position, to which it has been lifted by the cam 9. Said retention of the arm 72. confines the detaining-arm g in a corresponding position and prevents the same from engaging the shoulder d on the lever d, which is thereby free to be actuated by the spring a, which causes said lever to shift the driving-belt onto the loose pulley. This result is prevented so long as the paper passes to the impression-cylinder, said paper tilting the feelers n with their props at, so as to prevent the arms 0 from coming in contact with the tops of said props.

What I claim as my invention is l. The combination, with the impressioncylinder and its actuating mechanism, of a pneumatic tripper controlling said mechanism, a guard disposed to be actuated by paper retarded in its passage from the impression-cylinder, and means actuated by said guard and controlling the aforesaid tripper.

2. The combination, with the impressioncylinder and its actuating mechanism, of a pneumatic tripper controlling said mechanism, a guard disposed to be actuated by paper retarded in its passage from the impression-cylinder, and a valve actuated by said guard, and controlling the aforesaid tripper as set forth.

3. The combination with the impressioncylinder, its actuating mechanism and fingers conducting the paper from said cylinder, of a vertically-yielding guard-finger sustained normally in proximity to and parallel with one of the conducting-fingers, and a pneumatic tripper adapted to arrest the actuating mechanism and controlled by the guard-finger.

4. The combination, with the impressioncylinder, its actuating mechanism and fingers conducting the paper from said cylinder, of a pneumatic tripper adapted to arrest the actuating mechanism, a valve controlling said tripper, and a vertically-yielding guard-finger sustained normally in proximity to and parallel with one of the conducting-fingers and actuating the Valve as set forth.

5. The combination, with the impression cylinder, its actuating mechanism and fingers conducting the paper from the impressioncylinder, of a guard-finger extending lengthwise of and normally parallel over one of the conducting-fingers and pivoted to be actuated by paper buckled upon said conducting-finger, a pneumatic tripper adapted to arrest the actuating mechanism, and a lever actuated by the guard-finger and controlling the tripper.

6. The combination, with the impressioncylinder, its actuating mechanism and fingers conducting the paper from said cylinder, of a guard-finger extending lengthwise of and normally parallel over one of the cond uctingfingers and pivoted to be actuated by paper buckled upon said conducting-finger, a pneumatic tripper adapted to arrest the actuating mechanism, a valve controlling said tripper,

and a lever actuated by the guard-finger and moving said valve. 7

7. The combination with the impressioncylinder, its actuating mechanism and fingers conducting the paper from said cylinder, of

&

a stop mechanism controlling said actuating mechanism, a guard-finger extending lengthwise over one of the conducting-fingers and pivoted to be actuated by paper buckled upon said conductingfinger, a lever extending from the guard-finger, a pneumatic tripper controlling the actuating mechanism, and a valve connected to the aforesaid lever and controlling the tripper as set forth.

8. The combination with the impression cylinder, automatic paper-supplier, feed-table, the finger conducting the paper from the impression-cylinder and mechanism actuat ing said impression-cylinder and paper-supplier in common, of a spring-actuated lever stopping the actuating mechanism, a cam forcing said lever in opposition to its actuating-spring, a detaining-arm movable to and from a position to confine said lever in its cam-forced position, a feeler disposed to be actuated by the paper in transit to the inipression-cylinder and controlling the aforesaid detaining-arm, a guard-finger extending lengthwise over one of the aforesaid conducting-fingers and pivoted to be actuated by paper buckled upon the conducting-finger, a pneumatic tripper controlling the detainingarm independently of the aforesaid feeler, and a valve controlling said tripper and actuated by the guard-finger as set forth.

TALBOT O. DEXTER. [L. s.] Witnesses:

G. V. B. LErrcH, M. E. MORRISON. 

